[PATCH v3 01/20] mm: factor out large folio handling from folio_order() into folio_large_order()
From: David Hildenbrand <hidden>
Date: 2025-03-03 16:30:35
Also in:
cgroups, linux-doc, linux-fsdevel, linux-mm, lkml
Subsystem:
memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Let's factor it out into a simple helper function. This helper will also come in handy when working with code where we know that our folio is large. Maybe in the future we'll have the order readily available for small and large folios; in that case, folio_large_order() would simply translate to folio_order(). Reviewed-by: Lance Yang <redacted> Reviewed-by: Kirill A. Shutemov <redacted> Signed-off-by: David Hildenbrand <redacted> --- include/linux/mm.h | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7b21b48627b05..b2903bc705997 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -1194,6 +1194,11 @@ struct inode; extern void prep_compound_page(struct page *page, unsigned int order); +static inline unsigned int folio_large_order(const struct folio *folio) +{ + return folio->_flags_1 & 0xff; +} + /* * compound_order() can be called without holding a reference, which means * that niceties like page_folio() don't work. These callers should be
@@ -1207,7 +1212,7 @@ static inline unsigned int compound_order(struct page *page) if (!test_bit(PG_head, &folio->flags)) return 0; - return folio->_flags_1 & 0xff; + return folio_large_order(folio); } /**
@@ -1223,7 +1228,7 @@ static inline unsigned int folio_order(const struct folio *folio) { if (!folio_test_large(folio)) return 0; - return folio->_flags_1 & 0xff; + return folio_large_order(folio); } #include <linux/huge_mm.h>
@@ -2139,7 +2144,7 @@ static inline long folio_nr_pages(const struct folio *folio) #ifdef CONFIG_64BIT return folio->_folio_nr_pages; #else - return 1L << (folio->_flags_1 & 0xff); + return 1L << folio_large_order(folio); #endif }
@@ -2164,7 +2169,7 @@ static inline unsigned long compound_nr(struct page *page) #ifdef CONFIG_64BIT return folio->_folio_nr_pages; #else - return 1L << (folio->_flags_1 & 0xff); + return 1L << folio_large_order(folio); #endif }
--
2.48.1